| 主权项 |
1. An exhaust gas processing device for a diesel engine, the device comprising:
a DPF (1); a DPF regeneration section (3); an electronic control unit (14) with integral circuitry comprising a PM accumulation amount estimating section (2) for PM accumulated in the DPF (1), a DPF regeneration control section (4), and memory (5); an accelerated regeneration requiring information notification section (6); an accelerated regeneration starting operation section (7); and an accelerated regeneration re-requirement notification section (41), wherein an accelerated regeneration requirement determination value J2, a normal regeneration starting determination value J3, and a normal regeneration prohibition and accelerated regeneration re-requirement determination value J4 higher than the determination values J2 and J3 are stored in the memory (5), the DPF regeneration control section (4) is programmed to compare a PM accumulation amount estimate obtained by the PM accumulation amount estimating section (2) with the plurality of determination values J2, J3, and J4, automatically start normal regeneration processing by the DPF regeneration section (3) to increase a temperature of exhaust gas (11) to be passed through the DPF (1) when the PM accumulation amount estimate increases to the normal regeneration starting determination value J3, start notification of accelerated regeneration requiring information by the accelerated regeneration requiring information notification section (6) when the PM accumulation amount estimate is equal to or higher than the accelerated regeneration requirement determination value J2 as a result of determination for accelerated regeneration requirement after the start of normal regeneration processing, switch the normal regeneration processing by the DPF regeneration section (3) to accelerated regeneration processing to increase the temperature of the exhaust gas (11) to be passed through the DPF (1) as in the normal regeneration processing to make regeneration speed of the DPF (1) higher than that in the normal regeneration processing when the accelerated regeneration starting operation section (7) carries out accelerated regeneration starting operation after the notification of the accelerated regeneration requiring information is started, continue the normal regeneration processing by the DPF regeneration section (3) when the accelerated regeneration starting operation section (7) does not carry out the accelerated regeneration starting operation after the notification of the accelerated regeneration requiring information is started, and prohibit the normal regeneration processing, wherein the accelerated regeneration re-requirement notification section (41) starts notification of accelerated regeneration re-requiring information when the PM accumulation amount estimate becomes equal to or higher than the normal regeneration prohibition and accelerated regeneration re-requirement determination value J4, and thereafter, the DPF regeneration control section (4) is programmed to not carry out the regeneration processing of the DPF (1) unless the accelerated regeneration starting operation section (7) starts the accelerated regeneration starting operation to cause the DPF regeneration control section (4) to carry out the accelerated regeneration processing by the DPF regeneration section (3). |
